package service

import (
	"github.com/leanote/leanote/app/info"
	"github.com/leanote/leanote/app/db"
//	. "github.com/leanote/leanote/app/lea"
	"gopkg.in/mgo.v2/bson"
	"time"
//	"strings"
)

// 用户组, 用户组用户管理

type GroupService struct {
}

// 添加分组
func (this *GroupService) AddGroup(userId, title string) (bool, info.Group) {
	group := info.Group {
		GroupId: bson.NewObjectId(),
		UserId: bson.ObjectIdHex(userId),
		Title: title,
		CreatedTime: time.Now(),
	}
	return db.Insert(db.Groups, group), group
}
// 删除分组
// 判断是否有好友
func (this *GroupService) DeleteGroup(userId, groupId string) (ok bool, msg string) {
	/*
	if db.Has(db.GroupUsers, bson.M{"GroupId": bson.ObjectIdHex(groupId)}) {
		return false, "groupHasUsers"
	}
	*/
	db.DeleteAll(db.GroupUsers, bson.M{"GroupId": bson.ObjectIdHex(groupId)})
	return db.DeleteByIdAndUserId(db.Groups, groupId, userId), ""
	
	// TODO 删除分组后, 在shareNote, shareNotebook中也要删除
}
// 修改group标题
func (this *GroupService) UpdateGroupTitle(userId, groupId, title string) (ok bool) {
	return db.UpdateByIdAndUserIdField(db.Groups, groupId, userId, "Title", title)
}

// 得到用户的所有分组(包括下的所有用户)
func (this *GroupService) GetGroupsAndUsers(userId string) ([]info.Group) {
	// 得到分组s
	groups := []info.Group{}
	db.ListByQ(db.Groups, bson.M{"UserId": bson.ObjectIdHex(userId)}, &groups)
	// 得到其下的用户
	for i, group := range groups {
		group.Users = this.GetUsers(group.GroupId.Hex())
		groups[i] = group
	}
	return groups
}
// 仅仅得到所有分组
func (this *GroupService) GetGroups(userId string) ([]info.Group) {
	// 得到分组s
	groups := []info.Group{}
	db.ListByQ(db.Groups, bson.M{"UserId": bson.ObjectIdHex(userId)}, &groups)
	return groups
}
// 得到分组, shareService用
func (this *GroupService) GetGroup(userId, groupId string) (info.Group) {
	// 得到分组s
	group := info.Group{}
	db.GetByIdAndUserId(db.Groups, groupId, userId, &group)
	return group
}

// 得到某分组下的用户
func (this *GroupService) GetUsers(groupId string) ([]info.User) {
	// 得到UserIds
	groupUsers := []info.GroupUser{}
	db.ListByQWithFields(db.GroupUsers, bson.M{"GroupId": bson.ObjectIdHex(groupId)}, []string{"UserId"}, &groupUsers)
	if len(groupUsers) == 0 {
		return nil
	}
	userIds := make([]bson.ObjectId, len(groupUsers))
	for i, each := range groupUsers {
		userIds[i] = each.UserId
	}
	// 得到userInfos
	return userService.ListUserInfosByUserIds(userIds)
}

// 得到我所属的所有分组ids
func (this *GroupService) GetBelongToGroupIds(userId string) ([]bson.ObjectId) {
	// 得到UserIds
	groupUsers := []info.GroupUser{}
	db.ListByQWithFields(db.GroupUsers, bson.M{"UserId": bson.ObjectIdHex(userId)}, []string{"GroupId"}, &groupUsers)
	if len(groupUsers) == 0 {
		return nil
	}
	groupIds := make([]bson.ObjectId, len(groupUsers))
	for i, each := range groupUsers {
		groupIds[i] = each.GroupId
	}
	return groupIds
}

func (this *GroupService) isMyGroup(ownUserId, groupId string) (ok bool) {
	return db.Has(db.Groups, bson.M{"_id": bson.ObjectIdHex(groupId), "UserId": bson.ObjectIdHex(ownUserId)})
}	
// 为group添加用户
// 用户是否已存在?
func (this *GroupService) AddUser(ownUserId, groupId, userId string) (ok bool, msg string) {
	// groupId是否是ownUserId的?
	if !this.isMyGroup(ownUserId, groupId) {
		return false, "forbidden"
	}
	
	// 是否已存在
	if db.Has(db.GroupUsers, bson.M{"GroupId": bson.ObjectIdHex(groupId), "UserId": bson.ObjectIdHex(userId)}) {
		return false, "hasUsers"
	}
	
	return db.Insert(db.GroupUsers, info.GroupUser{
		GroupUserId: bson.NewObjectId(),
		GroupId: bson.ObjectIdHex(groupId),
		UserId: bson.ObjectIdHex(userId),
		CreatedTime: time.Now(),
	}), ""
}
// 删除用户
func (this *GroupService) DeleteUser(ownUserId, groupId, userId string) (ok bool, msg string) {
	// groupId是否是ownUserId的?
	if !this.isMyGroup(ownUserId, groupId) {
		return false, "forbidden"
	}
	return db.Delete(db.GroupUsers, bson.M{"GroupId": bson.ObjectIdHex(groupId), "UserId": bson.ObjectIdHex(userId)}), ""
}
